Think of it this way.. If this site and Github vanished with out warning it would be a massive blow.
Or if theymos implemented coin release rules or banned posting scam coins.
If .. this site and Github vanished, it will be replaced immediately by another forum. So yes, you can expect a massive blow for a few days ans then back to normal.
Who controls the Altcoin scene ? The financial institutions. Guys with lots of money in Wall Street, the City, etc. Those guys are expert in making money.